Keep in mind that if you mark the quantity of the penultimate "e", you distinguish two of the forms (the two alternate ending forms of the future indicative passive and perfect indicative active) from the other three. The five forms really aren't identical, but I can see where there would be a problem if your text does not mark accents.

Best,
Lisa

PS: Always include the mood when you conjugate! what happens is that one becomes so immersed in the indicative at the start, that one thinks of this as the "default" mood. Forgetting to indicate the mood is indicative is a common problem when you conjugate on a quiz or a test. Take it from someone who has graded a few tests.

Yes can I say, I did notice that too As D'Ooge marks all and emphasises the differences between accents long and short I felt this to be somewhat dodgy for the words were not, as quite rightly stated above, identical.
Anyhow a sweet exercise. Exerciti sumus bene!!